Answer
Please see the figure attached.
Work Step by Step
As can be seen in the figure attached, ${\bf{F}}$ is a unit vector field tangent to the family of ellipses ${x^2} + 4{y^2} = {c^2}$.
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 17 - Line and Surface Integrals - Chapter Review Exercises - Page 970: 6
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